Compensating-bearing.



No. 000,570. PATENTED SEPT. 20, 1905.

J. HARTNBSS. f

COMPENSATING BEARING.

APPLICATION FILED APB. 13, 1903.

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UNITED sTATEs PATENT oEEioE.

COMPENSATING BEARING- Specification of Letters Patent.

Patented Sept. 26, 1905.

Application filed April 13, 1903. SerialNo.152,353.

To n/ZZ whom, it may con/cern:

Be it known that l, JAMES HARTNEss, of Springlield, in the county otlVindsor and State of Vermont, have invented certain new and usefulImprovements in Compensating Bearings, of which the following is aspecification.

This invention has for its object to provide a bearing for rotatingbodies which automatically compensates for wear.

On the accompanying drawings, Figure l represents the spindle of a lathewith the bearings therefor constructed according to the invention. Fig'.2 represents a section on the line 2 2 of Fig. l. Fig. 3 represents asection on the line 3 3 of Fig. l.

Referring to the drawings, a indicates a rotary member, which isillustrated in the form of a hollow lathe-spindle equipped at one endwith a chuck, (indicated as a whole at ZJ.)

ln metal-working machinery it is desirable that the spindle or rotatingmember should be held firmly against longitudinal movement to insure theaccuracy of the operations on the work, and at the same time it isequally desii-able that the spindle should be held from chattering orworkingloose in its bearings. Consequently according to the presentinvention the bearings are so constructed that as they become worn theyare automatically adjusted to compensate for wear.

The standards or supports for the spindle are indicated on the drawingsat c CZ, respectively. These may form a portion of the headstock of thelathe or they may be constructed in any suitable way.

As illustrated, each bearing is equipped with a cap c eZ', as the casemay be, held in place by screws c2 (Z2. The spindle is provided with aportion d, which tapers inwardly from the chuck end and which terminateswith a shoulder (Z2. This frusto-conical or tapering portion of thespindle is mounted in a bushing e, which'is internally tapering, asshown, to accurately fit thereon. It is provided with a key d, adaptedto slide in a groove Z3 in the standard LZ, so that vwhile the bushingis held against rotation `it is nevertheless adapted to be moved towardthe chuck. Between a shoulder or iiange z5 on the spindle and thebracket o1' standard Z there are thrust-collars fi f5, by which thechuck is held against movement when it experiences the thrust of thetool upon the work. That portion of the spindle which is between theshoulder Z2 and the frusto-con ical portion 1s cylindrical, as shown,for the reception of a collar or washer e2, which bears against the endof the bushing e.

Upon the spindle L is a sleeve or collar f, which is rigidly secured inany suitable way to the spindle to bear against the shoulder (Z2. It maybe secured in place by a screw taking into a socket in the spindleorbyany other suitable means, such as hereinafter described. This sleeve orcollar is formed with sockets parallel to its aXis, in which are placedsprings f and pins f2, the pins bearing against the washer e2, andtherefore tending to force the bushing e toward the chuck. l/Vith thisconstruction it will be apparent that as the sha'ft or the bushing cbecomes worn by their frictional engagement the springs f will force thebushing longitudinally toward the chuck, so as to compensate for thewear. This automatic compensation may be effected, however, for thechuck end of the spindle by the same appliances which are employed forthe opposite or rear end thereof and which will now be described.

Screwed on the sleeve f there is a collar Zr, which may be secured inplace by a pin and a grooved block 702. This collar is keyed to theshaft, as indicated at The sleeve f is likewise provided with anothercollar m, which may be locked in place by a screw m and grooved blockm2. Between this collar and the bearing CZ there are thrust-washers m3.By screwing up the collar m the spindle may be held against movement ineither direction with relation to the bearing CZ.

The standard or support c is provided with a tapering aperture. Theaperture may be formed directly in the standard or it may be formed in abushing r, secured therein by the pin f', so as to hold it againstlongitudinal and rotative movement. The bush g thus becomes a part, asit were, of the support c. Within the tapering aperture is placed abushing it, which is externally tapering, so as to fit accuratelytherein. This bushing is provided with a screw-pin ZU, extending into aslot in the periphery of the spindle and eX- tendinglongitudinallythereof. Secured upon the spindle and bearing against a shoulder a thereis a sleeve or collar t', formed with sockets parallel to its axis forthe reception ot' springs e" and pins 2. These pins bear against awasher j', which is inserted between the collar and the end of thebushing Zt. As the two bushings 'Zt and g become worn by frictionalcontact the bushing ZL is moved longitudinally away from the chuck endof the IOO IIO

spindle, so as to compensate for the wear. By virtue of thisconstruction the Spindle is prevented from all lateral vibration orInovement and at the same time is rigidly held against longitudinalmovement.

It is apparent that with each form of bearing for the two ends of thespindle there are interposed between the spindle and the standard orsupport two complementa] members in wedging engagement, of which one islongitudinally movable With respect to the other. In the bearing for thechuck end of the spindle the bushinge forms one of the said members, andthe tapering portion of the spindle forms the other of said members. Itis true that the tapering portion of the spindle is in the formindicated an integral part of the spindle; but it might be formedseparately and secured thereto, just as in the case with the bearing forthe rear end of the spindle the bushing g might be made an integral partof the bracket or support c. In each case there is likewise anabutmenteto wit, the sleeve or collar or the sleeve or collar f andsprings interposed between the abutment and the movable wedging memberfor moving said member relatively to its complemental member.

VHaving thus explained the nature of the invention and described a wayof constructing and using the same, although without attempting to setforth all of the forms in which it may be made or all of the modes ofits use, I declare that what I claim is l. The combination of a rotatingmember, a support therefor, a compensating device inserted between saidmember and said support, means yieldingly pressing against saidcompensating' device to cause it to compensate for wear of said member,and means for holding said member and support against relative axialmovement.

2. The combination with a rotary member, of a support therefor,relatively to which the rotary member is held longitudinally immovable abushing interposed between the said member and said support, saidbushing and said member having complemental tapering surfaces, and meansfor automatlcally moving said bushing longltudmally between sald rotarymember and said support to compensate for wear.

3. The combination with a rotary member havin ga tapering portion, of asupport, a bushing inserted between said support and said member andhaving internal tapering surfaces complemental to the tapering portionof the rotating member, means for connecting the said bushing to thesaid support to hold it from rotation relatively thereto, and to permitit to slide longitudinally therein, an abutment rigidly secured to theshaft, and springs interposed between the said bushing and the saidabutment to advance said bushing along the said member to compensate forwear.

4. The combination with two elements, to wit, the rotating member and asupport relatively to which it is longitudinally stationary, of abushing interposed between said elements and having a tapering portionin engagement with the complemental tapering portion of one of saidelements, and means for yielding] y and automatically wedging saidbushing between said elements to compensate for wear.

5. The combination with two elements, to wit: a support and a shaft, oneof which elements is tapering, of means for holding said shaft againstlongitudinal movement relatively to the support, a tapering bushinginserted between said shaft and said support, an abutment on said shaft,and springs interposed between said abutment and the thicker end of saidbushing.

6. The combination with two elements, to wit: a support and a shaft, oneof which elements is tapering, of means for holding said shaft againstlongitudinal movement relatively to the support, a tapering bushinginserted between said shaft and said support, an abutment on said shafthaving sockets, springs and pins in said sockets, and a washerinterposed between the ends of said pins and the thicker end of saidbushing.

In testimony whereof I have afiixed my signature in presence of twowitnesses.

JAMES HARTNESS.

Witnesses:

J. W. BENNETT, AARON M. BAKER.

